LU-JOHN 896d900c9b
[AMDGPU] Create hi-half of 64-bit ashr with mov of -1 (#146569)
When performing a 64-bit sra of a negative value with a shift range from
[32-63], create the hi-half with a move of -1.

Alive verification: https://alive2.llvm.org/ce/z/kXd7Ac

Also, preserve exact flag. Alive verification:
https://alive2.llvm.org/ce/z/L86tXf.

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Signed-off-by: John Lu <John.Lu@amd.com>
2025-07-09 12:02:51 -04:00
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